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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>练习1</title>
    <style>
      h1{
        color: blue;
      }
      .t1{
        font-size: 40px;
      }
      .t2{
        font-size: 20px;
      }
      .t3{
        color: white;
        background-color: blue;
        height: 50px;
        font-size: 200%;
        padding-top: 5px;

      }
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<body>
    
    <div class="container">
        <h1 >This is a heading</h1>
        <p class="t2">
          Veggies es <span class="t1">bonus vobis</span>, proinde vos postolo essum magis
          kohlrabi welsh onion daikon amaranth tatsoi tomatillo melon azuki bean
          garlic.
        </p>
        <h2 class="t3">A level 2 heading</h2>
        <p>
          Gumbo beet greens corn soko endive gumbo gourd. Parsley shallot
          courgette tatsoi pea sprouts fava bean collard greens dandelion okra
          wakame tomato. Dandelion cucumber earthnut pea peanut soko zucchini.
        </p>
      </div>
  
</body>
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